Stephen Cobeldick

Last seen: Today

6,182 total contributions since 2014

Suspensa Vix Via Fit

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Answered
Using a string shortcut for nested structure
For accessing a field of one specific structure (which can be nested) you should use dynamic fieldnames: https://www.mathworks....

13 hours ago | 1

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How to save the result of stlwrite to a specific directory chosen by the user
TR = ... [F,P] = uiputfile('*.stl'); stlwrite(TR,fullfile(P,F))

13 hours ago | 0

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While loop not starting
Lets have a look at the first y value: >> f = @(x) 4*x^2 - 3; >> x(1) = 0.5; >> y(1) = f(x(1)) y = -2 And now look at your ...

1 day ago | 1

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Answered
FSOLVE requires all values returned by functions to be of data type double
The function handle definition is incorrect: @(B)@ourfun What you defined is an anonymous function which when called accepts o...

1 day ago | 1

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Answered
Indexing with two matrices
>> [C,~] = find(bsxfun(@eq,permute(A,[1,3,2]),permute(B,[3,1,2]))); >> C = reshape(C,size(B)) C = 2 1 2 4 3 4

2 days ago | 0

Answered
How to search through entirety of one field of a structure
The general solution is to use comma-separated lists: https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.h...

3 days ago | 0

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Importing data with unequal number of column
This is very simple and efficient using fscanf: [fid,msg] = fopen('Data.txt','rt'); assert(fid>=3,msg) mat = fscanf(fid,'%f',...

3 days ago | 1

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Answered
Extracting second number after comma within parenthesis
Simply match all text from the comma to the whitespace: >> str = 'Toc(Clock Data Ref Time) : 0x91E6 (37350,5.976000e+005 s...

3 days ago | 0

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Using strcmp with multiple inputs
You could use strfind or a regular expression to help you, e.g.: >> ixc = cellfun(@ischar,rw(:,3)); >> ixc(ixc) = ~cellfun('is...

4 days ago | 0

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Answered
declaring a new table
For historic and compatibility reasons if the variable does not exist before the dot-indexing allocates to it, then MATLAB will ...

4 days ago | 0

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How to convert these char values to datetime format?
The error is caused by the milliseconds in start string: either you need to remove them from the input string, or specify them i...

4 days ago | 1

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Answered
Trying to modify a vector by removing alternate elements
There is no point in defining n when it always has exactly the same value as the loop iteration variable i. Get rid of one of th...

5 days ago | 1

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How to solve pre-allocating array?
Using numbered variables is a sign that you are doing something wrong. Accessing numbered variables is one way that beginners f...

5 days ago | 1

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How to pass a matrix (m, 1) to (m / 2.2)
>> reshape(V,2,[]).' ans = 1 2 3 4 5 6

7 days ago | 1

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Answered
How to generate 1 cross zero structure in Matlab??
B = reshape(A,1,0)

8 days ago | 1

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Answered
How to call a created function in a different function
Download my FEX submission num2ordinal and use it together with func2str: function out = myNewFunc(fun) val = str2double(regex...

10 days ago | 0

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Answered
flip an array with the use of vectors
"Any suggestions?" Use indexing (which in MATLAB starts from 1): >> a = [1,7,5,9,3,2,4,1] a = 1 7 5 9 3 2 4 ...

11 days ago | 0

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Answered
Using Read Table with a predefined Table size
Accessing files via the OS is slow, note that creating an intermediate file requires accessing a file minimum three times. A sim...

12 days ago | 1

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How can I dynamically index into a nested struct that contains cell arrays
Essentially you are attempting to write a MATLAB parser using MATLAB. Such a task is not trivial, but for a very limited subset ...

12 days ago | 0

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Answered
How can I delete two or more elements in a vector?
>> A = [1,1,2,3,10,7,10,1,5,3]; >> U = unique(A); >> Z = U(histc(A,U)==1) Z = 2 5 7

13 days ago | 1

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Answered
inputs of multi-variable functions?
"Is there a right order for input variables in a function?" Yes: MATLAB function inputs are positional: The 1st input provided...

13 days ago | 0

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Answered
how to rearrange cell array with the grouped sequence
>> C = {21,3,'1';31,2,'1 1';25,1,'2 2 1 1'} C = [21] [3] '1' [31] [2] '1 1' [25] [1] ...

13 days ago | 0

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How to simplify code which reads multiple files
You don't need to repeat the entire code, just the dir call is enough: theFiles = [... dir(fullfile(myFolder, '*ABC*.csv')...

13 days ago | 0

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imshow not working when going from unit8 to double
Most likely because you did not scale the image when you converted the type. uint8 images are treated as having values from 0 t...

14 days ago | 0

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Looping a function with different inputs and storing multiple outputs.
The very simple solution is to loop over indices, and not over data (like you are doing): V1 = 0.5:1:2.5; % data! V2 = 0.5:1:2...

14 days ago | 1

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Answered
Save and Load .mat files with different names that numerically go up automatically. Maybe in a for loop?
"...as long as there is a way to load multiple of these in one go, without them all overwriting each other as fvalagg" This is ...

14 days ago | 1

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Answered
How to use cellfun?
fun = @(x,y) fminbnd(@(c0)objfunc(y,deg(c0,x,'other input parameters')),cm,cM); [C,V] = cellfun(fun,XM,YM,'Uni',0)

15 days ago | 1

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Answered
Anonymous function to calculate a sum
>> fun = @(x,n) x + sum(x.^(2:2:2*n) ./ factorial(2:2:2*n)); >> fun(3,5) ans = 12.066 Compare against your expansion: >> x ...

15 days ago | 2

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Answered
how to open such files "File B -ASCII" saved from MATLAB?
The -ASCII option saves a double array as a text file with space delimiters. This means: Any text editor can open that text fil...

15 days ago | 1

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Answered
How to read rows of data in .csv file and turn them into arrays?
Notes to consider when importing a large file: Importing as character and then doing any kind of text manipulation before conve...

15 days ago | 0

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